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1. WO1993018702 - PERIMETRE OPHTALMOLOGIQUE COMPORTANT UN BOL NON SPHERIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A perimeter comprising in combination:
an observing station having a point for placement of a patient's eye;
a fixation target for enabling a patient with an eye at said observing station to fixate on said fixation target whereby said eye of said patient is aligned with respect to said fixation target;
a bowl having a concave interior directed toward said patient; and,
a projector for projecting to said bowl at locations on said concave interior of said bowl light stimuli for
observation by the peripheral vision sensitivity of the fixated eye of said patient whereby the perimetry of said eye of said patient can be mapped;
the improvement in the shape of said bowl comprising in combination:
said bowl having a substantially bullet shaped interior projection profile elongate and symmetrical about an axis including a patient viewing station at said open end of said bullet shaped profile and said fixation target adjacent said projection surface on said axis;
said projection surface forming an interior continuum for the projection of images to stimuli for observation by an eye at said observation station fixated on said fixation target;
said projection surface in the central 30° of solid angle of vision requiring no more than 1/2 diopter of
accommodation for viewing stimuli.

2. The invention of claim 1 and wherein said bullet shaped interior projection profile of said projection surface includes:
a first hemispherical section defining a concavity directed toward said patient; and,
said bowl having a second inside conic section joined to said hemispherical section and forming a projection continuum with between said hemispherical section and said cylindrical section whereby said projection surface of said perimeter has a bullet shaped interior profile.

3. The perimeter of claim 2 and wherein said conic section of said perimeter is cylindrical.

4. The perimeter of claim 2 and wherein said hemispherical section of said bowl defines a radius to said sphere ranging from 15 to 20 centimeters.

5. The perimeter of claim 2 and wherein said hemispherical section of said bowl defines a radius to said sphere of 17.5 centimeters.

6. The perimeter of claim 4 and where said conic section has a length in the range of 8 to 16 centimeters.

7. The perimeter of claim 5 and wherein said conic section is cylindrical and has a length of 12.5 centimeters.

8. The perimeter of claim 2 and where said
projector protrudes off the cylindrical axis of said conic section of said bowl for the projection of images to said bowl.

9. A perimeter comprising in combination:
an observing station having a point for placement of a patient's eye;
a fixation target for enabling a patient with an eye at said observing station to fixate on said fixation target whereby said eye of said patient is aligned with respect to said fixation target;
a bowl having a concave interior directed toward said patient; and,
a projector for projecting to said bowl at locations on said concave interior of said bowl light for observation by the peripheral vision sensitivity of the fixated eye of said patient whereby the perimetry of said eye of said patient can be mapped;
said bowl having a substantially bullet shaped interior projection profile elongate and symmetrical about an axis including a patient viewing station at said open end of said bullet shaped profile and said fixation target adjacent said projection surface on said axis;
said projection surface forming an interior continuum for the projection of images to stimuli for observation by an eye at said observation station fixated on said fixation target;
said projection surface in the central 30° of solid angle of vision requiring no more than 1/2 diopter of
accommodation for viewing stimuli.

10. The invention of claim 9 and wherein said bowl at said concave interior includes:
a first hemispherical section defining a concavity directed toward said patient; and,
said bowl having a second inside conic section joined to said hemispherical section and forming a projection
continuum with between said hemispherical section and said cylindrical section whereby said projection surface of said perimeter has a bullet shaped interior profile.